Volvo Troubleshooting Questions? Ask a Mechanic for Answers ASAP
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This hesitation is it effecting all gears when throttle is applied or only when leaving a red light?
Can you or have you tried cleaning the throttle body and MAF sensor?
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I always clean the throttle body plate and bore while mounted and open using brake cleaner and a tooth brush. I use the same spray on the MAF sensor.
I would expect to see codes and lights on warning you if it were the throttle pedal, though we can test it if you have a scan tool.
When you unplug the MAF it can stall the engine. When the PCM is not getting an accurate sensor signal, it uses defaults in its place. So in some cases the default running strategy is close to the actual reading so there is not much effect.
A code reader can not check the readings from sensor inputs, which we would need to do to test the throttle pedal.